document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1199237>Question 1199237</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A high school student was able to save $7000 by working a part-time job every summer. He invested half the money in a money market account and half the money in a stock that paid three times as much interest as the money market account. After a year he earned $490 in interest. What were the interest rates of the money market account and the stock?<BR>\n" );
document.write( "Answer in percentages and round to one decimal place. </SPAN>\n" );
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document.write( "let x be the interest rate for the money market<BR>\n" );
document.write( "then 3x is the interest rate for the stock<br><BR>\n" );
document.write( "Half of $7000, or $3500, invested at each rate yields $490 interest:<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3500%28x%29%2B3500%283x%29=490 ALIGN=MIDDLE  ALT=\"3500%28x%29%2B3500%283x%29=490\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3500%284x%29=490 ALIGN=MIDDLE  ALT=\"3500%284x%29=490\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=490%2F%2814000%29=7%2F200=.035 ALIGN=MIDDLE  ALT=\"x=490%2F%2814000%29=7%2F200=.035\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "ANSWERS:<BR>\n" );
document.write( "interest rate on money market: x = .035 = 3.5%<BR>\n" );
document.write( "interest rate on stock: 3x = .105 = 10.5%<br><BR>\n" );
document.write( "CHECK: 3500(.035)+3500(.105) = 122.5 + 367.5 = 490<br><BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );